基质吸力对非饱和网纹红土抗剪强度影响研究  

RESEARCH ON THE EFFECTS OF MATRIC SUCTION ON SHEAR STRENGTH OF UNSATURATED RETICULATE RED CLAY

作　　者：宋会娟[1,2] 李建中[1,2] 葛延明[1,2] 

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083

出　　处：《工业建筑》2017年第12期7-10,16,共5页Industrial Construction

基　　金：国家自然科学基金项目(41572269);中南大学中央高校基本科研业务费专项资金资助项目(2017zzts787)

摘　　要：非饱和土中的基质吸力对土体的抗剪强度具有很大的影响,为了研究非饱和网纹红土基质吸力对抗剪强度的影响,采用滤纸法和直剪试验法分析非饱和网纹红土抗剪强度随基质吸力的变化规律。试验结果表明:黏聚力对基质吸力变化的敏感程度高于内摩擦角;随基质吸力的增大,黏聚力均呈现出先增大后减小的变化规律,最大提高幅度达200%;内摩擦角随基质吸力的增大而增大,增大幅度约为200%,而含水率的变化规律则相反。Matric suction has a great influence on the shear strength of unsaturated soil.The filter paper test and direct shear test were adopted to investigate the changing laws of shear strength with matric suction for unsaturated reticulate red clay.The results showed that the sensitivity of cohesion to matric suction changes was higher than the internal friction angle.And the cohesion increased at first and then decreased with the increase of the matric suction,and the increase degree was 200%.The internal friction angel also increased with the increase of the matric suction,and the increase degree was about 200%.However,the internal friction angel decreased with the increase of the moisture content.

关 键 词：非饱和土 基质吸力 抗剪强度 土-水特征曲线 

分 类 号：TU446[建筑科学—岩土工程]